MESON Chess Problem Database

Problem Display
PID: 144249 (b7/2n4p/2R1p3/2B1krPP/1NP2NP1/1r1P1pK1/7Q/b7 w - - 0 1)

Eerkes, Allard Pieter

American Chess Problemist, 1950

b7/2n4p/2R1p3/2B1krPP/1NP2NP1/1r1P1pK1/7Q/b7

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.Bd6#
    • 1...Bxc6
      • 2.Sxc6#
    • 1...Sb5
      • 2.Rxe6#
    • 1...Sd5
      • 2.Rxe6#
    • 1...Sa6
      • 2.Rxe6#
    • 1...Se8
      • 2.Rxe6#
    • 1...h6
      • 2.Sg6#
  • Keys
    • 1.Kxf3!
      • threat
        • 2.Qe2#
      • 1...Rxd3+
        • 2.Sxd3#
      • 1...Rxf4+
        • 2.Qxf4#
      • 1...Bxc6+
        • 2.Sxc6#
      • 1...Rxg5
        • 2.Sfd5#
      • 1...Rb2
        • 2.d4#
      • 1...Bd4
        • 2.Bd6#
      • 1...Sd5
        • 2.Rxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • B(a);SBLOCK::B(H)
    • B(i);XR(K)::S(D),XB(i)
    • S(g);N_GUARD::R1(K),XP(f)
    • P(h);N_GUARD::S(F)
  • Actual
    • K(C);P-FLIGHT,P_SPINP(B),P_SPINR(K),P_SPINS(F),XP(c)
    • Threat
      • QAR(A)
    • Vars
      • R(b);CHECK,XP(B)::S(D),XR(b)
      • R(e);CHECK,OGATE,P_SPINR(e),XS(F)::QAB1(A),XR(e)
      • B(i);CHECK,XR(K)::S(D),XB(i)
      • R(e);N_PINS(F),XP(I)::QAB(A)+S(F)
      • R(b);N_PINP(B)::P(B)
      • B(a);SBLOCK::B(H)
      • S(g);N_PINR(K)::R1(K),XP(f)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).